1649491 has 8 divisors (see below), whose sum is σ = 1781280. Its totient is φ = 1522752.

The previous prime is 1649489. The next prime is 1649507. The reversal of 1649491 is 1949461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1649491 - 2¹ = 1649489 is a prime.

It is a super-3 number, since 3×1649491³ = 13463907074457233313, which contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1649411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 570 + ... + 1903.

It is an arithmetic number, because the mean of its divisors is an integer number (222660).

2^1649491 is an apocalyptic number.

1649491 is a deficient number, since it is larger than the sum of its proper divisors (131789).

1649491 is a wasteful number, since it uses less digits than its factorization.

1649491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2525.

The product of its digits is 7776, while the sum is 34.

The square root of 1649491 is about 1284.3251146030. The cubic root of 1649491 is about 118.1544229311.

The spelling of 1649491 in words is "one million, six hundred forty-nine thousand, four hundred ninety-one".